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From iodine-plutonium-xenon isotope systematics, we re-evaluate timeconstraints on the early evolution of the Earth-atmosphere system and, byinference, on the Moon-forming event. Two extinct radioactivites (129I, T1/2 =15.6 Ma, and 244Pu, T1/2 = 80 Ma) have produced radiogenic 129Xe andfissiogenic 131-136Xe, respectively, within the Earth, which related isotopefingerprints are seen in the compositions of mantle and atmospheric Xe. Recentstudies of Archean rocks suggest that xenon atoms have been lost from theEarth's atmosphere and isotopically fractionated during long periods ofgeological time, until at least the end of the Archean eon. Here we build amodel that takes into account these results. Correction for Xe loss permits tocompute new closure ages for the Earth's atmosphere that are in agreement withthose computed for mantle Xe. The minimum Xe formation interval for the Earth-atmosphere is 40 (-10+20) Ma after start of solar system formation, which mayalso date the Moon-forming impact.

philosophical transactions - royal society. mathematical, physical and engineering sciences/philosophical transactions - royal society. mathematical, physical and engineering sciences

The iodine-plutonium-xenon age of the Moon-Earth system revisited